Because the enemy doesn't play that way with you. Even if you get rid of all the ack guns, it's usually not tanks that meet you there to "slug it out". It's a rain of bombs and a stream of 37mm AP projectiles from il's that take you out 
The town could be a great place to fight in.. if there the next airstrip was 10 minutes away, not 10 seconds 
it's always been bombs that take out tanks... it was only 37mm's when the new gun package was introduced.. remember? Before that you REALLY needed to work the 23mm on the IL2, or be one of the weirdo's that could aim from a b25.
Oh those hordes of panzers were caught off guard that first day we had the 37 in the IL2.. they thought they had the base just by porking ords and sending a horde of panzers. then they sent wirbles, and the t34-85's met them! LOL.
however, they adapted, and still ended up taking bases and making the game a routine.
the new radar changes, the new towns, people are adapting, changing tactics. I think I've seen more hording, but I think it's confirmation bias.
people will probably find their new routines, and hopefully htc will change em up right at the right time in the future..